Preparation of Alumina from NaOH-NaAlO₂-Na₂CrO₄-H₂O Solutions by Carbonization Process

Abstract:

Alumina was prepared from NaOH-NaAlO₂-Na₂CrO₄-H₂O solutions (chromate alkali solutions) by carbonization process. The effect of seed ratio, carbon dioxide (CO₂) volume fraction, reaction temperature, and initial sodium hydroxide (NaOH) concentration on the removal efficiency of Al was investigated in detail. High removal efficiency of Al was obtained following the increase of CO₂ volume fraction and temperature. While, initial NaOH concentration increases the stability of solution and reduces the removal efficiency of Al. Bayerite (Al (OH)₃) with small content of Cr (VI) and Na₂O was obtained from alkali metal chromate solutions at 50 °C with no seed. Particle size of bayerite (d₅₀) was about 24 μm. Al₂O₃ was obtained after calcination at 1050 °C for 1.5 h.

• Periodical: Applied Mechanics and Materials (Volume 455)
• Pages: 48-53
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.455.48
• Online since: November 2013
• Authors: Guang Ye Wei, Jing Kui Qu, Pei Yu Zhang, Qiang Guo, Yu Dong Zheng, Tao Qi, Yue Hua Li
• Keywords: Alumina, Carbonization, Chromate Alkali Solutions, Removal Efficiency

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